I've seen the intake bolts with the small "A" in the center and a flush head, meaning not sunken. These had a shoulder and were a stand alone bolt, no lock or flat washer. This is what I used on my '69 L78. Had most of them but AMK offers the exact bolt so I ordered a few extra. Not sure on the bell but I'm thinking the "M" bolt heads. There certainly could have been a change and possibly a change back, depending on purchasing at that time.
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